Improvement in double-bitted drills



UNITED STATES PATENT OFFIoEr WILLIAM H. YARBOROUGH, OF SHERMAN, TEXAS.

IMPROVEMENT IN DOUBLE-BITTED DRlLLS.

Specification forming part of Letters Patent No. 178,220, dated May 30,1876; application filed October 20, 1875.

To all whom it may concern:

Be it known that I, WILLIAM H. YARBOR- 0UGH,of Sherman,Grayson county,and State of Texas, have invented a new and useful Improvement inDouble-Bitted Drills, which improvement is fully set forth, in thefollowing specification, reference being had to the accompanyin gdrawings. 7

The object of my invention is to provide an easy mode of straighteningwells while drilling themthrough-rock or earth, and also for enlargingthe same into a cistern when it is desired to keep on hand a largesupply of water. This I am enabled to accomplish with the double-bitteddrill, hereinafter more fully described, consisting of a vertical stem,a, and two curved cutting-bits 0r chisels, b b, constructed as shown inthe vertical side view, Figure 1, and front view, Fig. 2, of theaccompanying drawing.

It has not been deemed necessary to show the drill attached to anyparticular well-boring machine, as it may be operated by any wellknownapparatus for that purpose.

The top of the stem at is provided with an eye, through a hole in whichpasses a rope, that is prevented from drawing through by a knot upon theunder side. Thisrope should extend upward over a pulley and connect withany suitable mechanism that will raise the drill and let it fall. Thebottom of the stemis forked, to receive the bits or chisels forcing themapart in opposite directions, and

also forcing their sharp edges against the sides of the well, cutting itaway in a circular form, by its weight and momentum. A sufficientquantity being chipped off and mixed with the water, that is always usedwhen drilling in rock, the drill is drawn out and a.

sand-bucket is let down and the drillings taken out, when the operationis repeated.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

A double-bitted drill, consisting of a stem, a, and two curved cutters,b b, pivoted as shown, and operated as and for the purpose herein setforth.

WILLIAM H. YABBOROUGH.

Witnesses:

EMILE J OUVENAL, ALVIN R. ANDREWS.

